s1_generate_a_series_of_files(){
for i in {1..100};
do
echo $i>/tmp/new_file$i;
done
}
s2_list_4_files_in_long_format_about_account_and_group(){
ls -l /etc/{passwd,shadow,group,gshadow} | sort
}
s3_find_items_related_to_given_username(){
grep -h $1 /etc/{passwd,shadow} | sort
}
s4_find_items_related_to_given_group_name(){
grep -h $1 /etc/{group,gshadow} |sort
}
s5_create_groups_for_given_group_names(){
groupadd rnd
groupadd itoperation
}
s6_create_users_and_set_their_group_as_required(){
useradd adam
useradd bob
useradd calvin
useradd david
useradd edward
usermod -a -G rnd adam
usermod -a -G rnd bob
usermod -a -G rnd edward
usermod -a -G itoperation calvin
usermod -a -G itoperation david
}
s7_change_users_shell(){
usermod -s /usr/bin/sh adam
usermod -s /usr/bin/sh edward
}
s8_set_password_change_policy(){
passwd -n 10 -x 60 -w 10 adam
passwd -n 10 -x 60 -w 10 bob
passwd -n 10 -x 60 -w 10 david
passwd -n 10 -x 60 -w 10 calvin
passwd -n 10 -x 60 -w 10 edward
}
s9_set_password_for_five_users(){
echo "adam:$1" |
chpasswdecho "bob:$2" | 
chpasswdecho "calvin:$3" | 
chpasswdecho "david:$4" | 
chpasswdecho "edward:$5" | 
chpasswd
}
s10_lock_bobs_password(){
usermod -L bob
}
s11_include_adam_into_wheel_group(){
sudo usermod -a -G wheel adam
}
s12_change_files_permission(){
for i in $(seq 3 3 100);
do
chmod 640"${pnew_file${i}}"
done
}
